Do you have a word in German for the picture that's sometimes at the bottom of kids' bowl/plates/cups that's sort of a reward for them if they eat all their food? or a word for bowls,etc that have that reward-picture?

What do you call pieces of wood cut expressly to fit in the slides of sliding windows and doors keeping them from opening? Or maybe allowing them to open just a certain amount and no more, or even better, pairs of sticks, one for complete closure, and one for cat-width opening.